Improvement in steam-generators



N`.`1`19,310, 'Patented sep. 26,1311.H

U23 BURKHARDT. Improvement in Steam Generators.

PATENT i Grrrcn.

GOTTLIEB F. BURKHARDT, OF BOSTON HIGHLANDS, MASSACHUSETTS.

lMPROVEMENTfIN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 119,310, dated September 26, 1871.

To all whom it may concern:

Be it-known that I, GOTTLIEB F. BURKHARDT, of Boston Highlands, in the State of Massachusetts, have invented certain Improvem ents in Steam-Generators; and I do hereby declare that thefollowing, taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention, sufficient to enable those skilled in the art to practice it.

My invention relates to certain improvements in steam-generators, having reference to the relative arrangement of the iiue and `water-spaces thereof. The invention consists, first, in the arrangement of threehorizontal tubular boilers in la vertical series, with a lire-pot or furnace at the front of the `u-pper boiler, with the flue-tubes of said boiler opening at their rear ends into a ilue or `lire-space between the upper' boiler and the next below it, which liuc-space, at its front end, communicates with the line-tubes of the second or center boiler, through which flue-tubes the fire and volatile products of combustion pass into the flue-tubes of the lower boiler, passing through which they escape into the chimney at the front end of the boiler, the flue-spaces being so arranged and having dampers so arranged that the fire, &c., may be drawn from the furnace through the fines of the upperboilerback through the return flue-space between the two uppermost boilers into the chimney, without passing through `the line-pipes of the middle boiler or those of the lower boiler.- The invention further consists in opening the exhaust int-o the space at the front of the second series of line-tubes so as to urge and quicken the draught at a point about midway between the furnace andthe escape-flue of the lower boiler. The invention further consists in the arrangement of the water-supply pipes and blow-off pipes, by which the lower boiler may be freed from water and blown off by the pressure of the steam from the upper boiler, the sediment and deposits which tend to settle in the lower boiler from the whole series being thereby driven off, and enabling the whole boiler to be kept clean and free from salts and other deposits, without stopping the fire or cessation of the steamgenerating operation.,

The drawing represents a boiler or series of boilers embodying my improvements.

A shows the boiler in side elevation of the masonry; B, a side elevation of the boiler, the masonry being removed; G, a section on the line :c m. a denotes the main boiler, having horizontal flue-tubes b in its lower part, and a 4steamspace or chamber in the upper part thereof, the safety-valve and exhaust being arranged with respect to this main or upper boiler in the ordinary manner. At the front of this boiler is the furnace c, having an ordinary grate, d, the arrangement ot' the furnace of the flue-tubes and tube-sheets being similar to what is found in ordinary horizontal boilers. Under the boiler a is a second and secondary boiler, c, having' horizontal ilue-tubesj", which open from aflue-space, g, at the front of said boiler, and into a vertical flue-space, 7L, at the rear thereof. The iiue-pipes Z) of the main boiler open into a iiue-space, i, at the rea-r end thereof, and this space i'opens into a horizontal flue-space, k, between the two boilers a c, said line-space k being formed by the bottom surface ofthe upper boiler, the upper surface ofthe boiler e, and the adjacent surfaces of the side walls ofthe masonry l. The rear iiue-space h is common tothe boiler e and a lower auxiliary boiler, fm, the horizontal liuc-pipes a of which extend from the space h, through the boiler m, into a iront liuc-space, o, which, by a flue-opening, p, communicates with the chimney g. The line-tubes n f of the boilers m c are surrounded by water-spaces, occupying all the room not occupied by the line-pipes, and the water-space of the lower boiler communicates with the waterspace of the next by a connecting-pipe, r, leading from the top ofthe lower boiler into the bottom of the next one, while the water-space of the second communicates with the water-space of the main boiler by a pipe or tube, t, connecting the top of the centerboiler with the bottom of the main boiler, the three boilers being charged with water from the pump through the supply-tube a.

When the lire in the furnace is well established the iiames and heat from it first pass directly through the flues of the main boiler, generating steam from the water surroundin g' such iues, from which iiues the iiame, smoke, Src., pass between and in contact Iwith the outer surfaces of the main boiler and the center boiler, heatingsaid surfaces, and passing thence through the ues of the center boiler into the flue-space It at the rear thereof, and thence forward through the tubes ofthe lower boiler, into the front flue-space o, from which :umano they escape into the chimney, after having, by long and tortuous passage, imparted all their caloric to the surfaces against which they have passed and the water back of such surfaces.

In starting` the re this tortuous passage s objectionable, and I therefore arrange a damper, o, in the chimney, this damper when thrown down, opening a nue-passage, w, leading from the fluespace into the chimney, and closing communication with the nue-passage o leading from the lower due-space into the chimney, the flames then escaping into the ohimneywithout passing through the iuepipes a, flue li, and nue-pipes f. When the fire is established the damper is closed against the flue-passage w, thus opening the flue-passage jp, when the name, smoke, and other volatile products of combustion will pass through all the nuetubes and spaces, as before described.

The exhaust-pipe from the engine leads into a pipe, m, which extends through the masonry and debouches into the flue-space g at the front of the second or center boiler, and the pressure of the exhaust steam urges an d quiekens the draught or acts as a blower, as will be readily understood. 'Ihe exhaust may be provided with a two-way cock, or with two cooks, so that the engine may be made to exhaust either into the atmosphere or into the ilues of the boiler, as may be desirable. Leading from the bottom ofthe lower boiler is a blow-oft` pipe, y, provided with a suitable stop-cock, and leading into the top of the lower boiler is a pipe, z, which extends from the stea1nspace at the top oi' the upper boiler, this pipe being provided with a suitable stop-cock, a2. In the supply-pipe r, connecting1 the lower boiler andthe one above it, is another stop-cock, b2. `Wl1en communication is open between all the boilers all sediment and deposits tend to settle into the lower boiler, and by shutting the supply-cock b2, opening the blowoft coek'c2, shutting the water-supply-cock d2, and opening the steamcock a2, the water will be driven from the lower boiler, and the pressure of the steam will carry With it all the dirt and other sediment and deposits. Previous to thus blowing off' the flueopeningp may be closed, shutting off the heat of the furnace from the lower boiler. After the lower boiler is thus blown oft' the supply-cocks Z12 d2 may be opened and all the water-tubes exposed to the action of the fire.

By the arrangement of the nues, flue-tubes, and Water-spaces, the water is gradually heated before it rises into the upper or steam-generating boiler, and all the caloric generated in the nace is utilized in heating the water and con verting it into steam and in urging the draught.

l. The arrangement of the main steam-generator boiler a, secondaryboiler e, and auxiliaryboiler mwith the furnace @flue-tubes bf a, and fluespaces t' g h le, substantially as shown and described.

2. In combination with the boilers and fines, arranged as described, the exhaust-pipe a: opening into the flue g, substantially as shown and described. Y

3. In combination with the boilers and ilues, arranged as shown and described, the flue-openings p w and damper o, arranged substantially as shown and described. n

4. In combination with the boilers, arranged as shown and described, the stop-cock b2 and blowott pipes, arranged to operate substantially as described.

GOTTLIEB F. BURKHARDT. 

